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Vetdle Archive

Archive Case #156: Equine Bone Spavin

Horse veterinary case - Easy - August 6, 2026

Clinical Clues

  1. A mature riding horse is evaluated for a chronic hindlimb lameness that is worse at the start of work.
  2. The rider says the gait improves somewhat once the horse warms up.
  3. The horse struggles on small circles and drags the toe of the affected hindlimb slightly.
  4. Flexion of the distal hock joints worsens the lameness.
  5. Radiographs show osteoarthritic change affecting the lower hock joints.
  6. Degenerative disease of the distal tarsal joints is commonly called bone spavin.

Diagnosis

Equine Bone Spavin

This case is most consistent with Equine Bone Spavin because the horse has chronic hindlimb lameness, a positive hock flexion test, and lower hock osteoarthritis on radiographs. The most important clues are the warm-up effect and distal tarsal joint involvement, which make an acute tendon injury less likely.

Learning review

Review the case evidence

Use the paired clues to explain how the evidence in this horse case supports the provided diagnosis, Equine Bone Spavin, then compare your reasoning with the case explanation.

Evidence checkpoints

Clues 1-2

  1. Clue 1: A mature riding horse is evaluated for a chronic hindlimb lameness that is worse at the start of work.
  2. Clue 2: The rider says the gait improves somewhat once the horse warms up.

Clues 3-4

  1. Clue 3: The horse struggles on small circles and drags the toe of the affected hindlimb slightly.
  2. Clue 4: Flexion of the distal hock joints worsens the lameness.

Clues 5-6

  1. Clue 5: Radiographs show osteoarthritic change affecting the lower hock joints.
  2. Clue 6: Degenerative disease of the distal tarsal joints is commonly called bone spavin.

Self-review prompts

  1. After clues 1-2, what evidence from this horse case shaped your initial interpretation?
  2. When you compare clues 3-4 with clues 1-2, what changed in your reasoning about Equine Bone Spavin?
  3. How do clues 5-6 align with the case explanation for Equine Bone Spavin?

Educational Use

Vetdle archive cases are educational veterinary games for diagnostic reasoning practice. They do not provide veterinary advice, diagnosis, treatment, or professional medical guidance.